Mike Tyson (L), promoter Don King and Evander Holyfield (R) pose before a fight (AP)Former heavyweight champions Mike Tyson and Evander Holyfield are continuing to take advantage of their notorious history together, turning it into a marketing opportunity.

In  1997, in perhaps the most heavily hyped rematch of all time, Tyson lost his composure and bit off part of Holyfield's ear. At the time, that earned Tyson a $3 million fine and a ban from boxing.

Nowadays, the one-time superstars have turned it into a marketing opportunity.

Holyfield with a Tyson shirtOn Monday, Holyfield tweeted a photo of himself wearing a T-shirt bearing the image of Tyson's facial tattoo. He wrote:

@MikeTyson bit my ear and all I got was this lousy t-shirt.

Tyson is selling the T-shirt as part of the Mike Tyson Collection.

That followed on the heels of a Twitter exchange between them in June, in which Tyson helped Holyfield sell his Real Deal Barbecue sauce.

It's good that they can joke about it now -- Tyson apologized to Holyfield on "The Oprah Show" in 2009 -- but it was hardly a joking matter the night of the

Boxer Sergio Martinez canceled a public workout due to threats and vandalism (AP)It's a sign of the times that a boxer has to cancel an open workout for the media due to security threats, but that's what has happened Monday to middleweight Sergio Martinez.

A combination of threats made to him and the vandalization of a car parked in front of the home where he was living caused him to cancel a workout scheduled for Tuesday in Oxnard, Calif.

Promoter Lou DiBella said Martinez will do an open workout soon in Los Angeles to promote his Sept. 15 fight on HBO Pay-Per-View for the World Boxing Council middleweight title in Las Vegas against Julio Cesar Chavez Jr.

"This past weekend, Sergio received threats from an unknown source and the car [parked] in front of his home was vandalized," DiBella said. "Unfortunately, until we have a security team in place, we are going to have to suspend any and all public and media appearances for Sergio, including the upcoming media day scheduled [Tuesday] in Oxnard. We apologize to the media and fans who had planned on attending

Timothy Bradley won a split decision over Manny Pacquiao on June 9 (AP)Almost every move Timothy Bradley has made in the aftermath of his hotly disputed split decision win over Manny Pacquiao on June 9 in Las Vegas has been the wrong one.

His decision to call out Pacquiao on Wednesday, with Pacquiao only days away from choosing his next opponent, only adds to the list of his strategic errors since the bout.

In a decision that outraged millions around the world and prompted the Nevada attorney general to conduct a review of the bout, Bradley won a split decision over Pacquiao at the MGM Grand Garden Arena on June 9 to claim the World Boxing Organization welterweight title.

[Related: Top Rank requests MGM for Nov. 10 'Pacquiao event']

Perhaps never in boxing history has a win hurt a man more. Even Bob Arum, Bradley's promoter, was outraged at the call. Upon the bout's completion, he raced over to reporters at ringside and railed at the call.

Can you believe that? I had it 10-2! After I got into the ring after the fight, I went over to Bradley and said 'You